20216145751 has 4 divisors (see below), whose sum is σ = 20218161600. Its totient is φ = 20214129904.

The previous prime is 20216145727. The next prime is 20216145769. The reversal of 20216145751 is 15754161202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20216145751 - 2⁹ = 20216145239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20216125751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 992806 + ... + 1012963.

It is an arithmetic number, because the mean of its divisors is an integer number (5054540400).

Almost surely, 2^20216145751 is an apocalyptic number.

20216145751 is a deficient number, since it is larger than the sum of its proper divisors (2015849).

20216145751 is a wasteful number, since it uses less digits than its factorization.

20216145751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015848.

The product of its (nonzero) digits is 16800, while the sum is 34.

The spelling of 20216145751 in words is "twenty billion, two hundred sixteen million, one hundred forty-five thousand, seven hundred fifty-one".